Improvement in steam-boilers



NITE STATES' Arnim Frioul.

IMPROVEMENT IN STEAM-BOILERS.

Spccilication forming part oi' Letters Patent No. 110,39 E, dated October 27, 1.563; vantedated October 17, 1863. i

To all whom it may concern.-

Be it known that I, JOHN BRIGGs, of Louisville, in the county of Jefferson and State of Kentucky, have invented a new and useful Improvent in Steam-Boilers; and I do hereby declare the following to be a full and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l represents a vertical longitudinal section through one of a pair of twin boilers, illustrating my invention. Fig. Zisahorizontal section at x x, Fig. 1. Fig. 3 is a vertical transverse section at y y, illustrating the mode of applying theinvention to a single boiler. Fig. 4 is `a perspective View, upon a larger scale, showing an improved form ofcoupling em ployed for connecting two cylinders in4 transverse positions. Fig. 5 is avertical section of the same.

Similar letters of referencey indicate corresponding parts in the several views.

The nature of my invention consists, iirst, in an improved construction of boiler which provides a Very large extent of heating-surface Without the necessity of interior or return tlues; second, in a device for connecting certain parts of my improved boiler, third, in an improved device for superheating steam in the cupola or drum.

In order to enable others skilled in the art to which my invention appertains to fully understand and use the same, I will proceed to describe its construction and operation. y

A A represent apair of twin boilers of cylindrical form, placed side by side and connected underneath by transverse cylinders B,

B', and C, of unequal depth, the larger cylinders, B B', extending downward nearly to the bottom of the iiue, while beneath the smaller cylinders, G, a space exists sufficient to permit free passage of the products of combustion.

D is the furnace, and E the horizontal and F F ascending'flues.

G is a steam-drum or cupola attached transversely to the top of the boilers and inclosed by a casing, H, the space within which communicates with the furnace through a short flue, I, guarded by a damper, t'.

J is a flue guarded by a damper, j, and employed to conduct the products of combustion from the vinterior of the casing H to the ascending and discharge flues F.

K represents a reservoir placed within the discharge-dues for the reception and heating of feed-water.

O is a steam-pipe, andP a water-pipe, communicating from the boiler to the reservoir K, and vice versa. The pipe O is provided with astop-cock, o.

The transverse cylinders B, B. C, and G are connected to the main cylinders A Aby means ofa coupling, L L, of peculiar construction.

Figs. 4 and 5 show said coupling on a larger scale and indicate its form more clearly. It is formed of two annular concave hanged plates riveted together at their centers in the manner shown, and curved to t the convex surfaces ofthe respective cylinders which they are to connect, a suitable washer, Z, beinginterposed to form a tight joint. They are then firmly bolted or riveted to the cylinders around or over corresponding openings formed therein for the passage of the fluid.

The coupling L L may be adapted and employed to connect cylinders in parallel or any transverse or oblique portions. Itis by pret'- erence formed out of plain square plates about one-sixteenth of an inch thicker than those used to form the shell oi' the boiler. If preferred, it may be made in circular form.

Suitable shields or deiiectors may, if needful, be placed beneath the cylinder B and above the cylinders C to cause the products of combustion to pass up over the first-named cylinder between the boilers and down below the smaller cylinders, C. A sufficient space isleft between the cylinder B and the bottom of the flue to pass the heavier smoke, soot, and impurities, while the clearer and hotter products of combustion pass over the said cylinder in contact with it and with the body of the boiler. The red arrows indicate the course of the products of combustion.

The cylinder Bserves asamud-drum, which is necessary in all boilers where impure water is used, and also takes the place of the principal tire-wall.

Any desired number of boilers may be placed side by side and worked in connection in the manner above described.

In the modification illustrated in Fig. 3, A2 represents aplain cylindrical boiler; G2, the steam-dome or cupola; B2, a vertical cylinder projecting downward tothe bottom of thetlue, and C2 a transverse horizontal cylinder similar to those represented at C in Figs. l and 2. E2 and F2 are the flues.

The above described boiler is especially adapted for stationary purposes and for ocean and river steamers. The following are among its advantages:

First. It obviates the necessity for nre-Walls or other masonry Within the dues, the various parts of the boiler itself serving to deflect the gases in such a way that their greatest heat is applied directly to the Water-surface.

Second. It entirely avoids the use of internal flues subjected to a compressing force and having a consequent tendency to collapse.

Third. It avoids the use of return-fines in which the products of combustion after having parted with most of their heat are passed through the hottest part of the boiler.

Fourth. The iiues are all of sufficient capacity to afford free and uniform draft Without danger of cramping and Without becoming foul.

Fifth. Every part of the interior is readily accessible for cleaning.

Sixth. Thecoupling L L reduces the cost y, and bulk involved in the use of Water-legs and adds to the strength and efficiency of the boiler. Seventh. r)She boiler may readily be taken in pieces for placing on shipboard or in position @to be used.

Finally, the present invention effects the great object of providing a steam-boiler of simple construction, easy and cheap in manu# facture, presenting the largest extent of Water andfire surface Within a given bulk and With a given quantity of metal, efficient in use, and readily cleansed.

Having thus described my invention,what I claim as new therein, and desire to secure by Letters Patent, is

1. A steam-boiler composed of one or more main horizontal cylinders with two or more transverse cylinders projecting downward into the furnace or flues when the said transverse cylinders are formed of unequal depth or Width, so as to receive more direct and full contact of the products of combustion, substantially as herein described, and this Whether the said transverse cylinders be connected to the main cylinders directly by means of the coupling L L or through the medium, of Water-legs.

2. The coupling L L', constructed of two convex plates connected by bolts and flanges and employed in the manner and for the purposes herein set forth.

3. The transverse steam drum or cupola G, casing H, and iiues I and J, arranged and employed in combination with the boilers A A, in the manner and for the purposes specified.

JOHN BRIGGS.

Witnesses:

R. H. MAYHEW, CHARLns SMITH. l 

